1) I think this is Sakurai’s metaphorical description of birth. He arises from the “ocean” of amniotic fluid, onto the “beach,” and is born. The blood is also certainly a reference to birth. Sakurai actually used the word "namiuchigiwa," or "seashore," in a similar context in the lyrics to "Kalavinka." In "Kalavinka," he used it in contrast with "imawa no giwa" which means "the cusp of life and death." In Kalavinka, I translated "namiuchigiwa" as "the cusp of shore and sea."

NOTE: The Spanish translation is a re-translation of the English translation by Cayce. Cayce has only a marginal familiarity with Spanish, so the quality of this translation is unvetted, but Spanish-speaking fans, enjoy.